Sonic Labs Launches USSD: A Network-Native USD Stablecoin Backed by BlackRock and Frax Infrastructure

TLDR:

• USSD is backed 1:1 by U.S. Treasury bills held with BlackRock, Superstate, and WisdomTree funds.
• Sonic’s native stablecoin offers zero minting fees and permissionless access through non-custodial smart contracts.
• USSD supports cross-chain minting and redemption across more than 10 networks, including Ethereum and Base.
• Reserve yield from USSD flows back into the Sonic ecosystem, funding buybacks and network-wide incentives.
  

USSD, the US Sonic Dollar, is now live on Sonic as a network-integrated stablecoin. Sonic Labs announced the launch of this permissionless, zero-fee digital dollar.

The asset is built on Frax Finance’s frxUSD infrastructure. Backed 1:1 by U.S. Treasury bills, it draws reserves from BlackRock, Superstate, and WisdomTree.

Available across more than 10 chains, USSD is designed to anchor stable liquidity across Sonic. It also serves as the network’s core dollar primitive.

Institutional Reserves and Network-Native Design Set USSD Apart

Sonic Labs designed USSD to address a persistent problem in decentralized finance. When stable assets originate outside a network, trading, lending, and settlement tend to form elsewhere.

A native stablecoin changes that by giving Sonic a shared dollar base. Every protocol on the network can then build around a single, reliable USD primitive.

The reserve structure behind USSD follows the same framework Frax applies to its stablecoin. Reserves consist of short-duration, tokenized U.S. Treasury products. BlackRock’s BUIDL, Superstate’s USTB, and WisdomTree’s WTGXX form the current reserve set. These assets are held with regulated custodians to maintain redemption confidence.

Sonic Labs shared the announcement on social media, writing: “Introducing USSD, the US Sonic Dollar. A network-native USD stablecoin built to be the stable liquidity layer across the Sonic ecosystem.” The team also confirmed backing from BlackRock, Superstate, and WisdomTree, alongside zero minting fees.

USSD is also designed to be GENIUS-compatible through its Frax frxUSD infrastructure. This alignment positions the stablecoin within a regulatory-compliant category.

It makes engagement more accessible for both institutional participants and everyday users. The structure is intended to support long-term predictability across DeFi applications on Sonic.

Cross-Chain Minting, Zero Fees, and Ecosystem Yield Define the Model

USSD is mintable through non-custodial smart contracts directly on Sonic. Users deposit supported USD assets at a 1:1 ratio with no minting fees applied.

Accepted assets include USDC, USDT, PYUSD, USDB, BUIDL, USTB, and WTGXX. Anyone can mint without custodial gatekeeping or added friction.

Cross-chain minting extends access well beyond Sonic itself. A user can deposit USDC on a separate chain and receive USSD directly on Sonic.

The system supports more than 10 chains at launch, including Ethereum, Base, and Arbitrum. This setup simplifies stable liquidity entry into the Sonic ecosystem.

Redemption follows the same flexible approach. Holders can redeem USSD 1:1 into supported USD assets on their preferred chain.

CCTP-supported chains are included in the redemption path, connecting the stablecoin to widely used dollar rails. Future phases will allow eligible users to convert to fiat, subject to KYC and issuer approval.

The yield from USSD’s Treasury-backed reserves flows back into the Sonic ecosystem. This supports buybacks and ecosystem incentives as usage grows over time.

Rather than allowing reserve income to leave the network, value is routed back to participants. USSD is, therefore, a key piece of Sonic’s broader vertical integration strategy.

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